[MS4W-Users] Using MS4W / GDAL to create very small images for use in an old GPS unit.

[Mark Volz]

Hello,

I would like to update the air photos that we have on an older GPS unit.  Currently the GPS unit has a few small MrSID air photos.  I need to create a very small file as the unit is old and has little RAM.  I created a GeoTIFF with a very aggressive JPEG compression (30%).  I was happy with size of the file and the relative quality.  Unfortunately, when I loaded the layer into my GPS unit the unit complained that it could not load compressed images, which is funny because MrSID files are already compressed.

I am wondering if there is a way to create very small files in a format other than Tiff.  My understanding is that the unit can load ECW, JPEG, JPEG2000, MrSid, and GeoTIFF files.

Thank You!

Sincerely,
Mark Volz, GISP
Lyon County GIS Coordinator

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